I literally just bought this (7/16/12 see receipt in photo) to install an ACME prop I bought for my X-10. I was lucky enough that when I put this on, my prop was so loose on the shaft that just tapping the blades with a rubber mallet knocked the prop loose. I didn't even have to crank down on the puller at all and could've easily removed the prop without the puller. Based on this, I don't think I'll need it to swap the prop out down the road, so I'm passing it along to somebody who can use it. You can see on the receipt I paid $74.95 plus shipping. I'll sell it for $70 shipped.